Relativistic deflection of radio signals in the solar gravitational field measured with VLBI

Details Relativistic deflection of radio signals in the solar gravitational field measured with VLBI Relativistic deflection of radio signals in the solar gravitational field measured with VLBI

Aug 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984natur.310..572r&link_type=abstract

Nature (ISSN 0028-0836), vol. 310, Aug. 16, 1984, p. 572-574.

Physics

24

Gravitational Lenses, Relativistic Effects, Signal Distortion, Solar Gravitation, Very Long Base Interferometry, Histograms, Radio Signals, Sensitivity, Stellar Radiation

Scientific paper

For an observer on Earth the general theory of relativity (GR) predicts an apparent outward displacement of a star seen at the Sun's limb of 1.75 arc s. A generalized formulation for gravitational deflection of light includes a parameter γ which ranges from 1 (GR) to -1 (no deflection). Radio interferometer measurements of deflections of extragalactic objects have all been consistent with GR with increasing accuracy. The authors report the most sensitive measurement of deflection so far achieved, in which very long baseline interferometry (VLBI) observations yield a value of γ of 1.008 with a 1 σ formal standard error of ±0.005.

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